Malicious PDF — malware analysis report

Static analysis result for SHA-256 e05cc98738617f1f…

MALICIOUS

PDF

102.5 KB Created: 2021-10-09 14:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0c2b40e12e3803f1d6772211e53b2152 SHA-1: 6f191ba20aaceb770add7058aa77793501409ff6 SHA-256: e05cc98738617f1f5dd546d752ec982662e9c9fa8771ccbe8f65dd700ed34687
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links and the use of UTM parameters suggest an attempt to drive traffic for malicious purposes, such as phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://satakantaresort.com/user_img/files/65400938977.pdf In PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/6037969511.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/lowiros.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23917114769.pdfIn PDF document text
    • https://kapefashion.com/files/files/ruwonezotuta.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/sosiwi.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/72132373828.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/fadolutetad.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/2339002116.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/zazazozakoxu.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139773d38cef---73598569168.pdfIn PDF document text
    • http://glassick.com/userfiles/file/jodazufelevama.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/rutejozutefuwazuxixuni.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/85982008878.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/54637517694.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615efafed4f9f---vubujiteziwovabivutivute.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/37467973504.pdfIn PDF document text
    • http://clingac.es/d/files/bisizewufajoz.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210905_071710.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/zowikobifajimiluba.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/23506593072.pdfIn PDF document text
    • https://pecintajp.com/contents/files/gasuzugu.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/74649020840.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/v34b9dp7i2d6895oqe5g7nttla/ruwukixekuda.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/jerejiketopibepekize.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/16649949006.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/nuferirodelizimida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=luffy+gear+1+first+time+episodePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001392d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392D 10916 bytes
SHA-256: 6024643903bb46353a913e6596e6d4cf1128a28818f0d8b5ff547fccf9302b44
font_02_sfnt_off0001525b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1525B 22128 bytes
SHA-256: 4075f5b07dd150d784c27a6d454dded43466f44bceb0b697e95deb6cfa92e19f

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